Jae Myeong Lee, Gichan Jeon, Wonkyeong Son, Sungwoo Chun, Duri Han, Hocheol Gwac, Jae Won Kim, Hyeon Jun Sim, Young-Kwan Kim, Ji Eun Park, Jungjin Park, Yung-Eun Sung, Seon Jeong Kim, Changsoon Choi
Department of Electronic Engineering and Biomedical Engineering, Hanyang University, Seoul, 04763 South Korea
Energy Storage Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792 Republic of Korea
Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826 Republic of Korea
School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826 Republic of Korea
Department of Electronics and Information Engineering, Korea University, Sejong, 30019 Republic of Korea
Department of Chemistry, Dongguk University-Seoul, 30 Pildong-ro, Jung-gu, Seoul, 04620 South Korea
Department of Biomedical Engineering, Konkuk University, Chungju, 27478 South Korea
Graduate School of Knowledge-based Technology and Energy, Tech University of Korea, Siheung, 15703 Republic of Korea
*Corresponding author.E-mail: sjk.hanyang.ac.kr, pccs2004@hanyang.ac.kr.
원문 링크 : https://doi.org/10.1002/adfm.202412397
Abstract
Carbon nanotube (CNT) coiled yarns have revolutionized 1D yarn actuators. However, their intrinsic twist-instability poses significant challenges, limiting their practical applicability. In this study, static and dynamic twist-stability are imparted to CNT coiled-yarn hydro-actuators by leveraging the inter-bundle anchoring effect. An inter-bundle anchor (IBA) is embedded within the coiled yarn by continuously twisting CNT sheets coated with a polymer agent. This integration enhances the inter-bundle connectivity within the yarns, ensuring twist retention of 97.5% in static mode. In dynamic mode, the IBA functions as an internal return spring, providing high actuation reversibility with torsional elasticity above 0.8 across repeated cycles. Furthermore, electrothermal recovery via Joule heating improves the actuation frequency to 0.039 Hz, and the pseudocapacitive properties of the polymer agent enable energy storage with an areal capacitance of 79.0 mF cm−2. These advancements underscore the potential of CNT-coiled yarn hydro-actuators for use in humidity monitoring, adaptive electronics, and various wearable and implantable applications.